Hi Cori,
I can't claim to be a proper
permie, but a pretty simple and organic approach that has worked for me is an extended-release treatment (as opposed to vapor/mist dosing) of oxalic acid. It's nice because you "can" just do it once a year, and it's organic, if not fully no-treatment. The foundation-less/frame-less, local swarm approach would be better, but around here (eastern MA) you can't be sure if a caught swarm is really feral, or just from nearby hive.
Here's what I posted on another
thread earlier:
I have found that the information here:
http://scientificbeekeeping.com/
and especially here:
http://scientificbeekeeping.com/extended-release-oxalic-acid-progress-report-4/
is extremely helpful in creating and applying a very effective organic treatment for varroa mites.
It calls for a a mixture of glycerine and oxalic acid (mine comes from Savogran "wood bleach", available at most hardware stores, and applied using blue shop towels (heavy paper towels, also from the hardware store), and it is research-proven to work, be safe, and from my own
experience, pretty easy to apply. I am a "hands-off" beekeeper, and this program (used for the first time last fall) suits me perfectly. I've lost several hives over the years, almost certainly to mites, but this winter my hive not only survived, but prospered, to the point where I have 4 hives at this moment, instead of the one I went through winter with! So, it does seem to work. (Initial hive was split, and then swarmed anyway, twice. Happily, the swarms ended up within 20 ft of hive, so I boxed them up, and now have 4 hives.)
I hope that helpful.
Mac